[PATCH 04/11] drm/i915/cdclk: Extract intel_audio_min_cdclk()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Pull the audio min cdclk calculation into a helper and hide
it inside intel_audio.c in order to keep most audio related
details in one place.

The one audio related thing that remains in intel_cdclk.c
is commit 451eaa1a614c ("drm/i915: Bump GLK CDCLK frequency when
driving multiple pipes") but given that's implemented in terms
of the cdclk_state I think it should stay put.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_audio.c | 45 ++++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_audio.h |  1 +
 drivers/gpu/drm/i915/display/intel_cdclk.c | 37 +-----------------
 3 files changed, 47 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c
index 32aa9ec1a204..82c45b24417a 100644
--- a/drivers/gpu/drm/i915/display/intel_audio.c
+++ b/drivers/gpu/drm/i915/display/intel_audio.c
@@ -978,6 +978,51 @@ static void glk_force_audio_cdclk(struct drm_i915_private *i915,
 	drm_modeset_acquire_fini(&ctx);
 }
 
+int intel_audio_min_cdclk(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(crtc_state);
+	struct drm_i915_private *dev_priv = to_i915(display->drm);
+	int min_cdclk = 0;
+
+	/* BSpec says "Do not use DisplayPort with CDCLK less than 432 MHz,
+	 * audio enabled, port width x4, and link rate HBR2 (5.4 GHz), or else
+	 * there may be audio corruption or screen corruption." This cdclk
+	 * restriction for GLK is 316.8 MHz.
+	 */
+	if (intel_crtc_has_dp_encoder(crtc_state) &&
+	    crtc_state->has_audio &&
+	    crtc_state->port_clock >= 540000 &&
+	    crtc_state->lane_count == 4) {
+		if (DISPLAY_VER(display) == 10) {
+			/* Display WA #1145: glk */
+			min_cdclk = max(316800, min_cdclk);
+		} else if (DISPLAY_VER(display) == 9 || IS_BROADWELL(dev_priv)) {
+			/* Display WA #1144: skl,bxt */
+			min_cdclk = max(432000, min_cdclk);
+		}
+	}
+
+	/*
+	 * According to BSpec, "The CD clock frequency must be at least twice
+	 * the frequency of the Azalia BCLK." and BCLK is 96 MHz by default.
+	 */
+	if (crtc_state->has_audio && DISPLAY_VER(display) >= 9)
+		min_cdclk = max(2 * 96000, min_cdclk);
+
+	/*
+	 * "For DP audio configuration, cdclk frequency shall be set to
+	 *  meet the following requirements:
+	 *  DP Link Frequency(MHz) | Cdclk frequency(MHz)
+	 *  270                    | 320 or higher
+	 *  162                    | 200 or higher"
+	 */
+	if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
+	    intel_crtc_has_dp_encoder(crtc_state) && crtc_state->has_audio)
+		min_cdclk = max(crtc_state->port_clock, min_cdclk);
+
+	return min_cdclk;
+}
+
 static unsigned long i915_audio_component_get_power(struct device *kdev)
 {
 	struct intel_display *display = to_intel_display(kdev);
diff --git a/drivers/gpu/drm/i915/display/intel_audio.h b/drivers/gpu/drm/i915/display/intel_audio.h
index 576c061d72a4..1bafc155434a 100644
--- a/drivers/gpu/drm/i915/display/intel_audio.h
+++ b/drivers/gpu/drm/i915/display/intel_audio.h
@@ -27,6 +27,7 @@ void intel_audio_codec_get_config(struct intel_encoder *encoder,
 				  struct intel_crtc_state *crtc_state);
 void intel_audio_cdclk_change_pre(struct drm_i915_private *dev_priv);
 void intel_audio_cdclk_change_post(struct drm_i915_private *dev_priv);
+int intel_audio_min_cdclk(const struct intel_crtc_state *crtc_state);
 void intel_audio_init(struct drm_i915_private *dev_priv);
 void intel_audio_register(struct drm_i915_private *i915);
 void intel_audio_deinit(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index 3103ecab980c..89d12c521411 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -2858,42 +2858,7 @@ int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state)
 
 	min_cdclk = intel_pixel_rate_to_cdclk(crtc_state);
 	min_cdclk = max(hsw_ips_min_cdclk(crtc_state), min_cdclk);
-
-	/* BSpec says "Do not use DisplayPort with CDCLK less than 432 MHz,
-	 * audio enabled, port width x4, and link rate HBR2 (5.4 GHz), or else
-	 * there may be audio corruption or screen corruption." This cdclk
-	 * restriction for GLK is 316.8 MHz.
-	 */
-	if (intel_crtc_has_dp_encoder(crtc_state) &&
-	    crtc_state->has_audio &&
-	    crtc_state->port_clock >= 540000 &&
-	    crtc_state->lane_count == 4) {
-		if (DISPLAY_VER(display) == 10) {
-			/* Display WA #1145: glk */
-			min_cdclk = max(316800, min_cdclk);
-		} else if (DISPLAY_VER(display) == 9 || IS_BROADWELL(dev_priv)) {
-			/* Display WA #1144: skl,bxt */
-			min_cdclk = max(432000, min_cdclk);
-		}
-	}
-
-	/*
-	 * According to BSpec, "The CD clock frequency must be at least twice
-	 * the frequency of the Azalia BCLK." and BCLK is 96 MHz by default.
-	 */
-	if (crtc_state->has_audio && DISPLAY_VER(display) >= 9)
-		min_cdclk = max(2 * 96000, min_cdclk);
-
-	/*
-	 * "For DP audio configuration, cdclk frequency shall be set to
-	 *  meet the following requirements:
-	 *  DP Link Frequency(MHz) | Cdclk frequency(MHz)
-	 *  270                    | 320 or higher
-	 *  162                    | 200 or higher"
-	 */
-	if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
-	    intel_crtc_has_dp_encoder(crtc_state) && crtc_state->has_audio)
-		min_cdclk = max(crtc_state->port_clock, min_cdclk);
+	min_cdclk = max(intel_audio_min_cdclk(crtc_state), min_cdclk);
 
 	/*
 	 * On Valleyview some DSI panels lose (v|h)sync when the clock is lower
-- 
2.45.2